Responses
*Spoiler*
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Replying for you. No, he did not have a child with his sister. Yes there is a mentioned of incest, but Sayan did not commit with his sister. The child was his sister and the priest. He lied about it so the King at the time wouldn't kill the priest (his sister fiance). Im sorry for bad English, but i hope you understand me.

Someone be honest with me did he really have a child WITH HIS SISTER if he did I can't bring myself to read this